JP7098625B2 - Wireless base station and communication control method - Google Patents

Description

The present invention relates to a radio base station and a communication control method that include a central device and a distributed device and perform wireless communication with a user device.

The 3rd Generation Partnership Project (3GPP) has specified Long Term Evolution (LTE), and has specified LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced) for the purpose of further speeding up LTE. In addition, 3GPP is also considering the specifications of the successor system to LTE called 5G New Radio (NR).

In NR, one form of configuration of a radio base station (gNB) is a central unit (CU) and a distributed unit (DU) that is located remotely from the installation location of the central unit. The configuration of a so-called C-RAN type radio base station including the above is being studied.

Specifically, the Higher Layer Split (HLS) has only the radio resource control layer (RRC) and the packet data convergence protocol layer (PDCP) in the CU, and the radio link control layer (RLC) and below in the DU. It is being considered.

Further, it has been proposed that the parameters of the user device (UE) unit are managed by the CU and the parameters of the cell unit are managed by the DU on the premise of HLS (see Non-Patent Document 1).

According to such a proposal, since the CU can hold the UE capability and information from the core network (for example, UE type, QoS Class Identifier (QCI), etc.), UE-specific parameters can be set. In addition, it is expected that the information on resources related to DU can be easily operated by multiple vendors because the interdependence between CU and DU can be suppressed by avoiding management by CU as much as possible.

“On the functional distribution over the F1 interface”, R3-171727, 3GPP TSG-RAN WG3 # 96, 3GPP, May 2017

However, the sorting of parameters between CU and DU shown in Non-Patent Document 1 has the following problems. For example, if the parameters for each UE and the parameters related to resource allocation are managed independently in a state where the CU and DU are separated, it is difficult to coordinate between the parameters (for example, Measurement Gap, Discontinuous Reception (DRX)). become.

Therefore, the present invention has been made in view of such a situation, and the parameter of the user device (UE) unit is managed by the central device (CU), and the parameter of the cell unit is managed by the distributed device (DU). It is an object of the present invention to provide a radio base station and a communication control method that can easily realize coordination between parameters.

One aspect of the present invention includes a first device (central device 210) and a second device (dispersion device 260), and a radio base station (radio base station 200) that executes wireless communication with a user device (user device 300). ), The first device includes a first parameter holding unit (parameter holding unit 215) that holds a plurality of parameters that control the wireless communication, and the second device contains parameters that control the wireless communication. The radio base station includes a second parameter holding unit (parameter holding unit 265) for holding a plurality of the parameters, and the radio base station manages the parameters held in the first parameter holding unit and the second parameter holding unit (parameters). The management unit 213 or the parameter management unit 263) is provided, and the parameter management unit obtains the coordination required parameter, which is the parameter that needs to be coordinated among the plurality of parameters, by the first parameter holding unit or the second parameter holding unit. Hold only one of them.

One aspect of the present invention is a communication control method by a radio base station including a first device and a second device and executing wireless communication with a user device, wherein the first device controls the wireless communication. A step of holding a plurality of parameters, a step of holding a plurality of parameters in which the second device controls the wireless communication, and a step in which the radio base station holds the parameters in the first device and the second device. In the step of managing the parameters, including the step of managing, the coordination required parameter, which is the parameter requiring coordination among the plurality of parameters, is held in only one of the first device and the second device. Let me.

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is an overall block configuration diagram of the wireless communication system 10. FIG. 3 is a functional block configuration diagram of the central device 210. FIG. 4 is a functional block configuration diagram of the distribution device 260. FIG. 5 is a conceptual diagram of the management operation of the coordination required parameters by the central device 210 and the distributed device 260. FIG. 6 is a diagram showing a management sequence (operation example 1) of parameters for wireless communication control including parameters required for coordination. FIG. 7 is a diagram showing a management sequence (operation example 2) of parameters for wireless communication control including parameters required for coordination. FIG. 8 is a diagram showing a management example of a target parameter in the radio base station 200. FIG. 9 is a diagram showing an example of the hardware configuration of the central device 210 and the distributed device 260.

Hereinafter, embodiments will be described with reference to the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.

Hereinafter, embodiments will be described with reference to the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.

(1) Overall Schematic Configuration of Wireless Communication System FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system according to Long Term Evolution (LTE) and 5G (NR), which is a successor system of LTE.

In this embodiment, LTE (including LTE-Advanced) is appropriately referred to as "4G" from the viewpoint of corresponding to 5G. Further, in the present embodiment, the wireless communication system 10 realizes an LTE assisted operation in which 5G complements 4G.

The radio communication system 10 includes a core network 20, a radio base station 100, a radio base station 200, and a user device 300.

The core network 20, also called Evolved Packet Core (EPC), is composed of a mobility management entity (MME), a serving gateway (S-GW), a PDN gateway (P-GW), and the like.

The radio base station 100 is a radio base station according to 4G, and is also called eNodeB. The radio base station 100 is connected to a device (node) constituting the core network 20 via an S1-MME or S1-U interface.

The radio base station 200 is a radio base station according to 5G, and is also called gNodeB. The radio base station 200 is connected to the radio base station 100 via an X2 interface (here, for convenience, referred to as X2-AP', X2-U').

The user apparatus 300 (UE) can execute wireless communication with the wireless base station 100 and the wireless base station 200. The user device 300 may be referred to as a wireless communication terminal or a mobile station. The radio base station 200 and the user device 300 control a radio signal transmitted from a plurality of antenna elements to generate a more directional beam, Massive MIMO, and carrier aggregation using a plurality of component carriers (CC). It can support CA) and dual connectivity (DC) in which component carriers are simultaneously transmitted between a plurality of radio base stations and a user device 300.

FIG. 2 is an overall block configuration diagram of the wireless communication system 10. As shown in FIG. 2, the radio base station 100 is composed of a central device 110 and a remote device 160. Similarly, the radio base station 200 is composed of a central device 210 and a distributed device 260. The radio base station 100 and the radio base station 200 may include devices other than the central device and the distributed device.

In the present embodiment, the central device 210 constitutes the first device, and the dispersion device 260 constitutes the second device.

The central device 110 has a radio physical layer (L1), a medium access control layer (MAC), a radio link control layer (RLC), and a packet data convergence protocol layer (PDCP). Further, the central device 110 has a radio resource control layer (RRC) as an upper layer of the PDCP.

The remote device 160 can be placed remotely by projecting from the installation location of the central device 110. The remote device 160 has a radio unit (RF) such as a PA (Power Amplifier) / LNA (Low Noise Amplifier), a radio transmission / reception module, and a modulation / demodulation module.

The central device 110 is also referred to as a digital processing unit (DU) or Central Unit (CU), and the remote device 160 is also referred to as a radio processing unit (Radio Unit (RU)) or Remote Unit (RU). The central device 110 and the remote device 160 are connected by a wired transmission line called a front hall. As an interface between the central device 110 and the remote device 160, for example, a Common Public Radio Interface (CPRI) is used.

The central device 210 and the distributed device 260 correspond to the central device 110 and the remote device 160 described above, respectively, but the layer configurations are different.

Specifically, the central device 210 has a radio resource control layer (RRC). On the other hand, the distributed device 260 has a radio link control layer (RLC), a medium access control layer (MAC), a radio physical layer (L1), and a radio unit (RF).

Such layer separation between the central device 210 and the distributed device 260 is called Higher Layer Split (HLS). Further, the central device 210 is called a Central Unit (CU), and the distributed device 260 is called a Distributed Unit (DU).

As described above, the central device 210 is connected to the central device 110 via the X2-AP'and X2-U' interfaces.

More specifically, in HLS, the central device 210 (CU) is responsible for processing the RRC / Service Data Adaptation Protocol (SDAP) / PDCP layer, and the distributed device 260 (DU) is responsible for processing the layers below RLC. Is expected.

Hereinafter, the central device 210 and the dispersion device 260 will be abbreviated as CU and DU as appropriate.

(2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of the central device 210 and the distributed device 260 will be described.

(2.1) Central device 210
FIG. 3 is a functional block configuration diagram of the central device 210. As shown in FIG. 3, the central device 210 includes an X2 IF unit 211, a parameter management unit 213, a parameter holding unit 215, a parameter determination unit 217, and an F1 IF unit 219.

The X2 IF unit 211 provides an interface for realizing communication with the central device 110. Specifically, the X2 IF unit 211 is an interface (X2) that directly connects the central device 110 and the central device 210. The transmitted / received data of the user device 300 is relayed to the radio base station 100 via the X2 IF unit 211.

The parameter management unit 213 manages various parameters held in the parameter holding unit 215, specifically, parameters that control wireless communication with the user device 300. Further, the parameter management unit 213 can manage not only the parameter holding unit 215 but also various parameters held in the parameter holding unit 265 (see FIG. 4) provided in the distribution device 260.

That is, the parameter management unit 213 can manage the parameters held in the parameter holding unit 215 and the parameter holding unit 265.

Of the plurality of parameters, the parameter management unit 213 holds only one of the parameter holding unit 215 and the parameter holding unit 265 for the parameters that require coordination among the plurality of parameters (hereinafter referred to as the coordination required parameters). Let me.

The coordination required parameter is a parameter for which recognition should be matched between CU and DU. For example, even if the DU determines and manages the content (set value) of the parameter, the DU notifies the CU of the content. It is a parameter that must be done. Further, in this case, the content of the parameter needs to be notified from the CU to the user apparatus 300.

In the present embodiment, a control and an interface for coordinating parameters for each user device (UE) and parameters related to resource allocation between CU and DU are provided.

The parameters required for coordination are not particularly limited as long as they are parameters for controlling wireless communication with the user apparatus 300 that meet the above definitions, but typically include the following parameters.

FIG. 8 shows an example of management of target parameters in the radio base station 200. As shown in FIG. 8, cell quality measurement interval (Measurement Gap), intermittent reception (DRX), uplink specific resource (UL dedicated resource), specifically, Physical Uplink Control Channel (PUCCH), Cell. -Specific Reference Signal (CRS) and Sounding Reference Signal (SRS) are listed as required parameters for coordination.

In addition, the transmission timing of notification information (System Information Block) and the transmission / reception timing of Channel State Information (CSI-RS) also correspond to the coordination required parameters.

The parameter management unit 213 manages only one of CU and DU for the parameters required for coordination. As shown in FIG. 8, in the operation example 1 described later, the coordination required parameters are managed in the DU, that is, the coordination required parameters are held. On the other hand, in the operation example 2 described later, the coordination required parameters are managed in the CU, that is, the coordination required parameters are held.

Further, as shown in FIG. 8, in the present embodiment, the parameter of the UE unit is managed by the CU (Yes in the figure) and the parameter of the cell unit is DU based on the proposal shown in Non-Patent Document 1. It is managed by. The specific management method of the parameters required for coordination will be described later.

Further, the parameter management unit 213 may have only one of the parameter holding unit 215 and the parameter holding unit 265 holding a part of the coordination required parameters. Specifically, the parameter management unit 213 can notify the DU while managing some of the parameters in UE units that require coordination between the parameters in the CU.

The DU determines the content of the parameter related to resource allocation based on the notified parameter. The DU notifies the CU of the content of the determined parameter.

An example of such a parameter is a case where the CU notifies the DU of the DRX cycle of the user device 300, and the DU coordinates the resource allocation parameter based on the DRX cycle to determine the content of the resource allocation parameter. Be done.

The parameter holding unit 215 can hold a plurality of parameters that control wireless communication with the user device 300. In the present embodiment, the parameter holding unit 215 constitutes a first parameter holding unit.

Specifically, the parameter holding unit 215 holds, deletes, or updates the parameter based on the control by the parameter management unit 213 (or the parameter management unit 263 described later).

The parameter determination unit 217 determines the content of the coordination required parameter (for example, the DRX cycle described above) in units of UE. In particular, when the parameter management unit 213 manages to hold the coordination required parameters only in the parameter holding unit 215, it is preferable that the parameter determining unit 217 determines the content of the parameter in UE units.

The F1 IF unit 219 provides an interface for realizing communication between the central device 210 and the distributed device 260. Specifically, the F1 IF unit 219 is an interface (called F1) that directly connects the central device 210 and the distributed device 260. The transmitted / received data of the user device 300 is relayed to the distributed device 260 via the F1 IF unit 219.

(2.2) Disperser 260
FIG. 4 is a functional block configuration diagram of the distribution device 260. As shown in FIG. 4, the distribution device 260 includes an F1 IF unit 261, a parameter management unit 263, a parameter holding unit 265, a resource allocation unit 267, and a wireless communication unit 269. Hereinafter, the same functions as those of the central device 210 will be omitted as appropriate.

Like the F1 IF unit 219, the F1 IF unit 261 provides an interface for realizing communication between the central device 210 and the distributed device 260.

The parameter management unit 263 has the same function as the parameter management unit 213. That is, the parameter management unit 263 can manage the parameters held in the parameter holding unit 215 and the parameter holding unit 265.

Either one of the parameter management unit 213 and the parameter management unit 263 becomes active, and the parameters may be managed by directly controlling the parameter holding unit 215 and the parameter holding unit 265, or the parameter management unit 213 and the parameter management may be performed. The parameter management unit 213 and the parameter management unit 263 may each operate in cooperation with the unit 263 to control the parameter holding unit provided in the own device.

Like the parameter holding unit 215, the parameter holding unit 265 can hold a plurality of parameters that control wireless communication with the user device 300. In the present embodiment, the parameter holding unit 265 constitutes a second parameter holding unit.

The resource allocation unit 267 executes resource allocation to the user device 300. Specifically, the resource allocation unit 267 allocates radio resources such as frequency and time to the user device 300. In particular, when the parameter management unit 263 manages to hold the coordination required parameters only in the parameter holding unit 265, it is preferable that the resource allocation unit 267 executes resource allocation to the user apparatus 300.

The wireless communication unit 269 executes wireless communication with the user device 300. Specifically, the wireless communication unit 269 executes wireless communication with the user device 300 according to the specifications of 5G. As mentioned above, the F1 IF section 261 can support Massive MIMO, carrier aggregation (CA), dual connectivity (DC), and the like.

(3) Operation of wireless communication system Next, the operation of the wireless communication system 10 will be described. Specifically, an operation in which the wireless base station 200 manages various parameters for controlling wireless communication with the user device 300 will be described.

(3.1) Schematic operation FIG. 5 is a conceptual diagram of a management operation of coordination required parameters by the central device 210 and the distributed device 260.

As shown in FIG. 5, the coordination necessary for determining the content of the coordination required parameter, that is, the exchange of information is executed between the central device 210 (CU) and the distributed device 260 (DU).

The distribution device 260 executes communication control for the user device 300 based on the contents of the coordination required parameters determined as a result of the coordination.

(3.2) Operation example 1
Next, an example of management operation of parameters for wireless communication control including parameters required for coordination will be described.

FIG. 6 shows a management sequence (operation example 1) of parameters for wireless communication control including parameters required for coordination. In this operation example, the coordination required parameters are managed (held) in the distribution device 260 (DU). In this operation example, the DU executes resource allocation.

As shown in FIG. 6, the central device 210 acquires the parameters for wireless communication control (step 1). The acquisition route of the parameter is not limited, but here, it is assumed that the parameter is acquired via the radio base station 100.

The central device 210 manages the parameters for each UE (see FIG. 8) among the parameters that do not require coordination (step 2). In addition, the central device 210 notifies the distributed device 260 of the required coordination parameters (step 3). The distributor 260 manages the required coordination parameters (step 4).

The central device 210 and the distributed device 260 perform coordination for the coordination required parameters (step 5).

For example, in response to a request from the CU to the DU, the DU can notify the CU of the parameters determined as a response to the request. Alternatively, in the Request from the CU, it may be notified that coordination is required and which parameter coordination is required. Further, along with the notification of the parameter from the DU, it may be notified that the parameter has been coordinated.

The distribution device 260 executes communication control for the user device 300 based on the content of the parameter determined as a result of coordination (step 6).

(3.3) Operation example 2
FIG. 7 shows a management sequence (operation example 2) of parameters for wireless communication control including parameters required for coordination. In this operation example, the coordination required parameters are managed (held) in the central device 210 (CU). Further, in this operation example, the CU determines the content of the parameter for each UE. Hereinafter, the parts different from the operation example 1 will be mainly described.

As shown in FIG. 7, the central device 210 manages the coordination required parameters (step 2). Further, the central device 210 notifies the distributed device 260 of the parameter for each cell (see FIG. 8) among the parameters that do not require coordination (step 3). The distributor 260 manages the notified cell-by-cell parameters (step 4). Hereinafter, coordination and communication control are executed in the same manner as in operation example 1.

(4) Action / Effect According to the above-described embodiment, the following action / effect can be obtained. Specifically, the radio base station 200 (parameter management unit 213 or parameter management unit 263) sets the coordination required parameter, which is a parameter that requires coordination among a plurality of communication control parameters, to the central device 210 (parameter holding unit 215). ) Or the disperser 260 (parameter holding unit 265).

Therefore, the parameters that require coordination between the parameters are aggregated in either the central device 210 or the distributed device 260. This makes it possible to avoid a situation in which coordination between the parameters (for example, Measurement Gap, Discontinuous Reception (DRX)) becomes difficult.

That is, according to the radio base station 200, even if it is assumed that the parameters for each user device (UE) are managed by the central device 210 (CU) and the parameters for each cell are managed by the distributed device 260 (DU). , Coordination between parameters can be easily realized.

In the present embodiment, the coordination required parameters are held only in the DU (parameter holding unit 265), and the DU can execute resource allocation to the user apparatus 300.

Therefore, the DU can quickly execute the resource allocation to the user apparatus 300 based on the coordination result of the coordination required parameter.

In the present embodiment, the coordination required parameters are held only in the CU (parameter holding unit 215), and the CU can determine the contents of the coordination required parameters in units of the user device 300.

Therefore, the CU can quickly determine the content of the coordination required parameter based on the coordination result of the coordination required parameter.

In the present embodiment, a part of the coordination required parameters can be held only by either the central device 210 (parameter holding unit 215) or the distribution device 260 (parameter holding unit 265).

Therefore, it is possible to notify the DU (or vice versa) while managing some of the parameters that require coordination between the parameters in the CU.

(5) Other Embodiments Although the contents of the present invention have been described above according to the embodiments, the present invention is not limited to these descriptions, and various modifications and improvements are possible. It is obvious to the trader.

For example, in the above-described embodiment, Higher Layer Split (HLS) is premised, but the present invention does not necessarily presuppose HLS. Specifically, the present invention can be applied even in the case of a split between RLC and RLC instead of a split between PDCP and RLC as in HLS.

In the above-described embodiment, the example in which the parameter of the UE unit is managed by the central device 210 (CU) and the parameter of the cell unit is managed by the distribution device 260 (DU) has been described, but such a management form is also indispensable. do not have.

In the above-described embodiment, the DRX Config is managed (controlled) by the DU for coordination, but some parameters of the DRX Config can be managed by the CU, so the DRX can be obtained. Part or all of the Config (eg drxStartOffset) may be controlled by the DU for coordination.

Further, in the above-described embodiment, an example of managing the required parameters for coordination that requires coordination between the parameters has been described. However, regarding the management of the parameters by the central device 210 (CU) and the distributed device 260 (DU), the following is described. You may execute as follows.

Specifically, since the wireless resource allocation is a cell-related process (cell process), it is preferable that the DU manages the related parameters. However, some parameters related to UE-related processing (UE processing) need to be linked with wireless resource allocation. Therefore, it is necessary to specify the procedure of the F1 interface that enables cooperation between CU and DU.

Parameters that need to be linked with wireless resource allocation include the above-mentioned Measurement Gap and DRX-related parameters.

In view of this situation, the following solutions can be considered. Specifically, the DU manages the parameters related to UE processing that need to be linked with the wireless resource allocation, and notifies the CU of the parameters via the F1-Control Plane (F1-C) interface. For example, the DU may notify the parameter by a response to a Request from the CU (Proposal 1).

Further, the DU may allocate radio resources according to the parameters related to UE processing managed by the CU. The CU notifies the DU via the F1-C interface about the parameters related to UE processing that need to be linked with the wireless resource allocation. (Proposal 2)
In addition, the CU manages radio resource allocation and parameters related to UE processing that requires radio resource allocation and coordination (Proposal 3).

According to such a management method, it is possible to allocate radio resources and perform necessary coordination for determining parameters related to UE processing, and it is possible to improve radio characteristics.

For example, by preventing the Measurement Gap from overlapping with the allocated radio resource, deterioration of user throughput can be avoided. Further, by duplicating the radio resources allocated as the trigger for transmitting and receiving the UE in the DRX, the efficiency of data transmission / reception in the DRX can be further improved.

In addition to the parameters described above, parameters determined by the policy of the MAC scheduler (for example, Buffer Status Report (BSR), Power Headroom Report (PHR)) are managed by DU even if they are UE-based parameters. May be good.

Furthermore, the parameters related to resource allocation set (configured) in RRC may be managed by the DU. Further, for bearer-related parameters, the CU may manage the RLC parameters and the DU may manage the logical channel group (LCG).
In addition, the DU may manage RRC / MAC parameters that need to be coordinated with UE individual resources. The DU may also manage MAC parameters related to scheduling.

The word "management" may be replaced with "control".

Further, the block configuration diagrams (FIGS. 3 and 4) used in the description of the above-described embodiment show functional blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly by two or more physically and / or logically separated devices. (For example, wired and / or wireless) may be connected and realized by these plurality of devices.

Further, the central device 210 and the distributed device 260 (the device) described above may function as a computer for performing the processing of the present invention. FIG. 9 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 9, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

Each functional block of the device (see FIGS. 3 and 4) is realized by any hardware element of the computer device or a combination of the hardware elements.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), and RAM (Random Access Memory). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the above-described embodiment.

The storage 1003 is a computer-readable recording medium, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. Storage 1003 may be referred to as auxiliary storage. The recording medium described above may be, for example, a database, server or other suitable medium including memory 1002 and / or storage 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information. Bus 1007 may be composed of a single bus or different buses between devices.

Further, the notification of information is not limited to the above-described embodiment, and may be performed by other methods. For example, information notification includes physical layer signaling (eg DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (eg RRC signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (MIB)). It may be carried out by Master Information Block), SIB (System Information Block)), other signals or a combination thereof. RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC. It may be a Connection Reconfiguration message or the like.

Further, the input / output information may be stored in a specific place (for example, a memory) or may be managed by a management table. The input / output information may be overwritten, updated, or added. The output information may be deleted. The entered information may be transmitted to other devices.

The order of the sequences, flowcharts, and the like in the above-described embodiments may be changed as long as there is no contradiction.

Further, in the above-described embodiment, the specific operation performed by the radio base station 200 may be performed by another network node (device). Further, the function of the radio base station 200 may be provided by a combination of a plurality of other network nodes.

The terms described herein and / or the terms necessary for understanding the present specification may be replaced with terms having the same or similar meanings. For example, the channel and / or symbol may be a signal, where applicable. Also, the signal may be a message. Also, the terms "system" and "network" may be used interchangeably.

Further, the parameter or the like may be represented by an absolute value, a relative value from a predetermined value, or another corresponding information. For example, the radio resource may be indexed.

The radio base station 100 and the radio base station 200 can accommodate one or more (eg, three) cells (also referred to as sectors). When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station RRH: Remote). Communication services can also be provided by Radio Head).

The term "cell" or "sector" refers to a portion or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage.
In addition, the terms "base station,""eNB,""cell," and "sector" may be used interchangeably herein. Base stations are sometimes referred to by terms such as fixed station, NodeB, eNodeB (eNB), gNodeB (gNB), access point, femtocell, and small cell.

The user device 300 may be a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, etc. It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

The phrase "based on" as used herein does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Also, the terms "including," "comprising," and variants thereof are intended to be as comprehensive as "comprising." Moreover, the term "or" as used herein or in the claims is intended to be non-exclusive.

Any reference to elements using designations such as "first", "second" as used herein does not generally limit the quantity or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.

Throughout the specification, if articles are added by translation, for example, a, an, and the in English, these articles must not be clearly indicated from the context to be otherwise. , Shall include more than one.

As mentioned above, embodiments of the invention have been described, but the statements and drawings that form part of this disclosure should not be understood to limit the invention. This disclosure will reveal to those skilled in the art various alternative embodiments, examples and operational techniques.

According to the above-mentioned radio base station and communication control method, it is assumed that the parameters of the user device (UE) are managed by the central device (CU) and the parameters of the cell are managed by the distributed device (DU). It is useful because coordination between parameters can be easily realized.

10 Wireless communication system
20 core network
100 radio base stations
110 Centralized equipment
160 Overhanging device
200 radio base stations
210 Central unit
211 X2 IF section
213 Parameter management department
215 Parameter holder
217 Parameter determination unit
219 F1 IF section
260 Disperser
261 F1 IF section
263 Parameter management department
265 Parameter holder
267 Resource Allocation Department
269 Wireless communication unit
300 user equipment
1001 processor
1002 memory
1003 storage
1004 communication device
1005 input device
1006 output device
1007 bus

Claims (5)

A radio base station that includes a first device and a second device and executes wireless communication with a user device.
The first device includes a first parameter holding unit that holds a plurality of parameters that control the wireless communication.
The second device includes a second parameter holding unit that holds a plurality of parameters that control the wireless communication.
The radio base station includes a parameter management unit that manages the parameters held in the first parameter holding unit and the second parameter holding unit.
The parameter management unit is a radio base station that allows only one of the first parameter holding unit and the second parameter holding unit to hold the coordination required parameter, which is the parameter that needs to be coordinated among the plurality of parameters. The parameter management unit holds the coordination required parameters only in the second parameter holding unit.
The radio base station according to claim 1, wherein the second device includes a resource allocation unit that executes resource allocation to the user device. The parameter management unit holds the coordination required parameters only in the first parameter holding unit.
The radio base station according to claim 1, wherein the first device includes a parameter determination unit for determining the content of the coordination required parameter in units of the user device. The radio base station according to claim 1, wherein the parameter management unit holds a part of the coordination required parameters only in either the first parameter holding unit or the second parameter holding unit. It is a communication control method by a radio base station that includes a first device and a second device and executes wireless communication with a user device.
A step in which the first device holds a plurality of parameters for controlling the wireless communication,
A step in which the second device holds a plurality of parameters for controlling the wireless communication,
The radio base station includes a step of managing the parameters held in the first device and the second device.
In the step of managing the parameters, a communication control method in which only one of the first device and the second device holds the coordination required parameters, which are the parameters that need to be coordinated among the plurality of parameters.

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